package yukicoder047;
import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		int sum=1;
		int count=0;
		while(sum!=n){
			if(sum*2<=n){
				sum*=2;
				count++;
			}else if(sum*2>n){
				sum=n;
				count++;
			}
		}
		System.out.println(count);

	}
}